When the neuron is at rest, which statement is true?
A) No Na+ crosses the membrane is the only observation.
B) The activation gate is closed and no Na+ crosses the membrane.
C) The activation gate is closed.
D) The activation gate is closed and the inactivation gate is open.
E) The inactivation gate is open.
D) The activation gate is closed and the inactivation gate is open.
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Which of the following describes what is directly measured by an ECG?
A) the force of contractions B) blood vessel resistance C) end-systolic volume D) electrical conduction E) neural stimulation of cardiac myocytes
The tube that drains bile from the liver is the:
a. common bile duct b. cystic duct c. hepatic duct d. major duodenal papillae
When a nurse draws blood, it is not uncommon for the needle to penetrate which muscle near the cubital region?
A. Semimembranosus B. Pronator teres C. Buccinator D. Pronator quadratus E. Supinator
When alveolar ventilation increases, the perfusion of pulmonary arterioles will ________.
A. increase B. remain unchanged C. decrease